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Airflow (orange), after a 1 m/s disc impact, becomes supersonic due to pinching water. Selected for an Editors' Suggestions and a Viewpoint in Physics. [Stephan Gekle, Ivo R. Peters, José Manuel Gordillo, Devaraj van der Meer, and Detlef Lohse, Phys. Rev. Lett. 104, 024501 (2010)] |


